A METHOD OF THE IDENTIFICATION AND CLASSIFICATION OF PYROCLASTIC FLOW DEPOSITS DUE TO HARDNESS

概要

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The main purpose herein is to present a method of the identification and classification of pyroclastic flow deposits distributed in southern Kyushu, Japan, from the viewpoint of soil engineering. Since the deposits have a hardness ranging from soft soil to hard rock, their hardness can be used as a criterion of the identification and classification for engineering purpose. It is proposed that the hardness is given by the index hardness of matrix of the deposits and is measured by applying Yamanaka's soil hardness tester. Here the author investigated the hardness at 145 locations in southern Kyushu and classified the deposits into five distinct groups as soft decomposed Shirasu, decomposed Shirasu, proper Shirasu and welded tuff. The propriety of proposed method is ascertained statistically by X^2-, F- and t-tests. The correlations between hardness, dry density and water content are also obtained. Finally a chart of the identification and classification of pyroclastic flow deposits is establiched on the basis of the relationship between hardness and dry density.
社団法人地盤工学会の論文
1979-03-15